Disclaimer: I don't own KHR.

"Cielo-kun~ I have a job for you~" A playful yet eerie voice echoed through the whole room.

"What is it?" A monotone voice asked the man on the other side of the dark room.

"Demo Cielo-kun~ Would you like to have a tea with me first?"

"I'm sorry but you know that I am in a hurry so it's a no. Maybe next time."

"Mou... Cielo-kun tara... Always leaving after finishing a mission. This is the sixtieth time you turned down my offer."

"If you're not going to tell me then fine. I still have a lot of work to do. Well then, up until next time. Jā, mata ne. " Then a bright orange-like flame filled the room, disappearing together with the man in the mask.

After the man disappeared, an ominous aura engulfed the whole room and the man stood up staring at the window, muttering something about a 'incoherent bastard being childish.'

xXx

At the same time a certain hitman who wears a black fedora with a thick orange stripe running across the sides of the cone, has black eyes and wears an all-black suit with black boots and a red long-sleeved polo with a blue necktie underneath had just finished his mission of wiping an entire familia who dared to harm Vongola.

He was just about to report the current boss of Vongola, Vongola Nono that he had finish his mission when he suddenly receive a call from the said man.

Staring at his phone, he readied himself to answer the call because if the Vongola Nono himself is calling him, it means it's something serious. After a few seconds of calming himself he answered the call.

"Nono, I had just finished my mission. Is there something that I can do for you?" He asked the man who was at the other side of the phone.

"Yeah there is a mission that I would like you to do." The man wearing a fedora heard the Ninth to talk to him in a serious voice. He isn't comfortable when he heard the man's serious voice because if he's that serious it means it's something big. Something big that can change the whole underground world. If it's for the better or not. He don't know.

"What is it?"

"I need you to train the Vongola Decimo."

"..." Reborn was stunned. He knew that he will soon be sent to train the incoming Vongola Decimo but not this soon.

"Reborn?"

"What?"

"I need you to train the Vongola Decimo."

"I know. But isn't it to soon. According to Iemitsu his sons are just thirteen years old." He tried to reason. He doesn't want to take the childhood of those children. He doesn't want to get such innocent young children to be involve to the darkness, the Mafia.

"I know they're just kids but we need to. We need the Vongola Decimo to be ready as soon as possible. I'm already too old to lead the Vongola"

"I understand. I will go to Japan tonight and see them first for a day."

"Thank you. I will ready the plane for you."

"Well then. See you next time."

xXx

"*Sigh"

"Reborn, My Love. That is the eighteenth time you sighed since you came home. Not to mention you're only home for half an hour. Is there something wrong?" A sweet loving voice was heard by the sighing man on other case, sighing baby.

"It's nothing Bianchi." A childish voice was heard followed by another sigh.

'It's still early for them to be involve in the underworld!' was the only thought that was being replayed endlessly inside the hitman's mind.

"Reborn, you can tell me what's bothering you. I might be able to help you." The woman who was called Bianchi arched a brow filled with worry at the man.

Reborn just ignored the woman and stood straight going to his room to pack his things needed on his trip to Japan. He didn't bother to tell Bianchi that he was going to train the upcoming Vongola Decimo at Japan because he was sure that she won't let him. And that was something that he needed to avoid. He don't want to disappoint the Ninth, so he would pack his things quietly and leave without telling anyone about his current mission.

xXx

The next day a Reborn went to the Sawada household to leave a mail on the mailbox that a home tutor would come to teach the twins. He didn't even realize that there was a pair of orange eyes focused on him from the second floor of the house.

An hour later a woman who has a honey brown hair went out the house to take the mails but she received a mail that there would be a home tutor sent to teach the twins. She hurried to go to the house to wake her sons and tell them the news.

She climbed up the stairs and went to her youngest room, Takeyoshi. The room was messy, nothing like her oldest, Tsunayoshi. The floor was filled with scattered clothes, books, magazines, bottles, wrappers, papers and toys.

"*Sigh" The woman then went beside her son and wake him up.

Takeyoshi had a brown-colored gravity-defying hair, dark-colored eyes and a tan skin.

"Ta-kun~ Wake up. You're going to be late." She tugged him softly but he did not even stir up.

Then see saw a piece of paper hidden under her son's pillow and looked at it. It was her son's math test, fourteen over one hundred.

She sighed again and said loudly, "Sawada Takeyoshi, who received fourteen in math?"

"Ha-Hai!" Takeyoshi flip his eyes open and sit immediately only to see his mother holding his test paper.

He reached to his mother to take the test paper but his mother stepped backward resulting him falling out of his bed. His head fist landed at the floor.

"Ta-kun. Are you okay?" She took the mail and let her son read the good news.

"What is this?" Takeyoshi asked his mother, his head still at the floor.

"Starting today a Katekyoshi is going to be coming. I saw this mail at the mailbox this morning and I called them immediately." She informed her son while a large grin is present on her face.

"I don't need a home tutor." Takeyoshi protested.

"I will raise your children to become the leader of the next generation. I am young and good-looking." She read the mail to her son happily. "And as long as they have a place to sleep and a meal, they'll teach you twenty-four hours for free."

"That just smell like a scam."

"Well anyway you're going to be late if you're not going to hurry."

"Kaa-san it's a weekend totay. It's Friday." He pouted.

The woman placed a hand on her mouth. "Oh… I see but breakfast would get cold if you're not going to eat it now."

"Hai." He said lazily and went towards the dining room only to stumble and fall on the stairs. His head again fell first on the floor.

When he fell he heard a baby voice day "Ciaossu."

He turned to his left only to see a baby in a black suit wearing a fedora. "So you're Takeyoshi huh?

Takeyoshi sat and said, "Well yeah I'm Takeyoshi." He leaned forward at the baby and continued to stare at the baby.

"Starting today I'll be looking after you."

"Wait, who are you?"

"Don't worry Takeyoshi."

That's when Nana went down stairs only to see a baby and said, "Where did you come from little boy?"

"I'm a home tutor, Reborn." He took his ID card and showed it to the two.

"Home tutor?" The woman asked.

"Reborn?" Takeyoshi asked.

After a few seconds of silence Nana and Takeyoshi laughed. They laughed very hard.

Tears forming on Takeyoshi's eyes, still laughing he said, "Don't make me laugh you're just a baby… Hahaha… My stomach hurts"

He failed to see a small foot being raised on top of his head. The foot quickly pulled back to the ground, hitting the Takeyoshi's head resulting it to hit the floor painfully.

"Well anyway, where is Tsunayoshi?" Reborn asked the woman because the boy had lost consciousness.

"Tsu-kun went out of the house a few minutes ago. He said he won't be back up until sunset."

"I see."

'Wait, how did he got off the house without me knowing it? I'm guarding it since three in the morning. It's not possible for me not to know it. So how did he got out the house? It's impossible to get passed me. And he's dame so that not possible'

xXx

'Oh… What is the number one hitman doing here in Japan? Especially in front of our house.' A certain boy who has a soft chestnut-colored gravity defying hair, doe-like and sunset colored eyes and milky-white skin thought at his room at the second floor.

He took his laptop and opened it, pressed the keyboard with different kinds of combination for his password and started to hack a certain site that has a very good connection with the said man.

There he saw that the Ninth has sent Reborn to train the next Vongola boss, the Vongola Decimo, his brother Sawada Takeyoshi.

A shiver run down up to his spine because the whole underground world would change for the worst if Takeyoshi would lead the Vongola, because his brother has a very wicked personality. He's only acting good if he saw their mother and other people other than him. And the Vongola is the most powerful and influential mafia familia in the world. So he decided that he would get on the hitman's way to train his brother.

And then an idea in his mind pop in his head and it is to take every familia member of his brother to him. They would live a hellish life if he won't do this. Everyone in the world even the civilian because Takeyoshi is greedy of power.

He decided to ask some of the mafia boss that he is close with to help him.

He closed his laptop and hide it again.

He went down from his room and went to his mother who is going to cook breakfast in the kitchen and said that he would go out and won't be back until sunset.

He covered himself with illusion so he won't be spotted by the hitman. He waited his mother to open the door to take the mails from the mailbox so he won't be seen opening and closing the door by the hitman. He don't want to be suspicious of him already.

He activated his Hyper Dying Will Mode and propelled himself to the sky and went to a place where to told the mafia bosses to meet with him.

xXx

He reached the place, still covered with his illusion and walked towards the center of the bosses. He saw Byakuran from Millefiore, Aria from Giglio Nero, Enma from Simon, Dino from Chiavarone, and many more bosses, maybe the room was filled with fifty different bosses.

He deactivated his illusion on him becoming invisible but his illusion mask and clothes are still activated.

He then greeted and thanked the bosses in answering to his call in a short period of time.

"Cielo-kun~ What do you need from us? Are you going to reveal you identity to us now~?" A man who has a spiky white hair, light purple eyes and a purple tattoo under his left eye asked jokingly.

The room was filled with chattering after he asked that.

"That's right Byakuran. But first I want all of you to promise to keep it a secret even from your own familia and promise that you're all going to help me with my plan. If you can't you may leave. And if you broke it I would personally kill you okay?" A seriously calm monotone voice had made the whole room quiet.

No one left the room. The room was filled with tension. Everyone wanted to know who was behind the mask. They wanted to know who is the world's greatest hacker and the one of the world's powerful hitman is. They wanted to know who is the one whom made his name known worldwide five years ago.

Tsunayoshi waited for a minute and when he saw no one left the room he continued.

"I guess everyone of you is willing to help me, right?"

"Cielo-san, what is your plan?" One of the bosses asked.

"I won't tell it if you're going out and won't help me. I can't risk my plan to be ruined."

"I see. But we're all willing to help you Cielo-kun. You helped us all when we need help and we're going to help you now because you need our help. And this is the first time that you asked us to help you." A woman who had a shoulder-length hair with parts of it on both sides of her head braided up and tied at the back, a sharp blue eyes with a Sky Pacifier around her neck said.

"Well, I'm asking all of you because you are my most trusted mafia bosses on this time." Then they saw Cielo taking off his illusion covering him by making the mist flames to dissipate in the air, only to see a small boy.

"Ehh?!" Everyone in the room yelled except a marshmallow lover and a small girl.

"So that's why you're acting childish when I always invited you for some tea." Byakuran said.

"That's not it! I needed to finish my homework!" Tsunayoshi pouted.

Everyone in the room became quiet and blushed from the adorable sight in front of them. They are holding their noses, stopping the flow of blood dripping from their noses.

"So, what is your real name Cielo-kun?" Aria asked happily.

"Sawada Tsunayoshi. But you can call me Tsuna"

"How old are you?"

"Thirteen."

"So you're telling us you've been only eight years old when you're helping us in crisis?" The Chiavarone boss asked dumbfounded.

"Yeah." Tsunayoshi said.

He then realized the people around him have the same face like Dino.

"Umm… Is there something wrong?" He asked cutely with a little pout.

When no one responded to him he tried to read their thoughts. 'An eight years old child helped me in saving my familia.'

A vein popped in his head when every thought that continuously except Byakuran and Aria.

Then the whole room was filled with an ominous aura. An aura that made everyone in the room gasped from the need of air, except for Byakuran and Aria because the aura is avoiding them.

He turned to Byakuran and Aria. "You two already know what to do, right" he asked them.

Upon hearing Tsunayoshi the two immediately covered their ears tightly.

"I see. Then sorry for helping you when you needed help. Do you prefer me not to help you." He said in an eerie and horrific voice and the ominous aura immediately thickened making the remaining forty-eight bosses to suffocate.

"Sorry." They all said in unison and the thick aura covering then dissipated.

"So, what is your plan Tsuna-kun~?" Byakuran asked.

"It's just simple but important."

"Important?" Dino asked.

"Yeah. It's just a plan where we will stop the mafia to change for the worst."

"Stop the mafia change for the worst? What to do mean?" The Simon boss asked.

"We're just going to stop my twin brother to become the Vongola Decimo." He said with finality.

The room suddenly became quiet. The occupants of the room was to shocked of the information that they had received.

"Why do you want to stop him to become the Vongola Decimo?" Byakuran asked.

"Byakuran don't asked me when you already know the answer. And Aria I know you already saw a dream where the whole world is ruined and saw my twin laughing."

Byakuran suddenly tensed. "How do you know that I know it already?"

Aria fell on her knees. "How did you know? I only had that dream today and I didn't tell anyone about it, not even Gamma."

"Byakuran you know that I know that you have the Mare rings, and it has the power to send you to different parallel worlds. And you just watched it happened to a few worlds already because you don't have the power to oppose him and I'm already dead on those parallel worlds because he killed me before I learned of his true nature. And I'm not a hitman on those worlds. Am I right?"

Byakuran just nod, dumbfounded.

"And Aria I already went to the future when I was seven and talked to your daughter, Yuni thanks to the Ten Year Bazooka. Though the bazooka was not perfect that time so I was sent fifteen years to the future and was stuck in there for a year and thanks to your mother whom asked someone to make an illusion of me for a year, so no one suspected me to be missing. Yuni told me everything that I should do. Starting from training and learning everything that I should do, hacking… And she told me that if I'm going to be sent back to my time I need to act dame so my brother would not kill me and start making my name at the underworld and if Reborn would arrive at our house to start to train my brother I need to call every mafia bosses that I trust and start the plan to stop my brother to become the Vongola Decimo."

Tsuna looked at the crowd in front of him and his honey-colored eyes turned to a sunset colored one and said seriously, "Only a few of you would remain alive in the future if we don't stop my brother..."

xXx

It was almost sunset and Reborn is still wondering how did Tsunayoshi went passed him. The only possibility that came to his mind is that he used illusion and fly to the sky. But that was impossible that three people who was living in the house is not in the mafia.

The report that Iemitsu told him is that Tsunayoshi is a dame kid and Takeyoshi is perfect to be a mafia boss though his grades is low and the other things in the report is how cute his sons are.

That's when a certain brunet went home from his tiring meeting.

"I'm back."

"Oh… Tsu-kun, Ta-kun and you would have a home tutor starting today." Nana informed his son happily.

"I see, but isn't Ta-kun need him more than I do?"

"Tsu-kun as long as they have a place to sleep and a meal, he'll teach you and Ta-kun twenty-four hours for free."

"I see." Then Tsna went his way up the stairs to his room.

"Tsu-kun~ Dinner would be ready for an hour alright? Be sure to go donw later."

"Hai."

He then opened the door of his room and closed it.

"I know I didn't give you permission to enter my room. Don't you even know how to respect privacy?" He said a little irritated.

The hitman was stunned because no one had been able to spot him in his life. He was spotted by a thirteen years old boy not to mention only in a second.

"How did you know I was here?" Asked a babyish voice.

Tsuna then throw himself in the bed and ignored the question.

Reborn was ticked off. Not did only the boy spotted him, he even ignored him. He then turned his chameleon to a gun and shot the boy.

Tsuna was snickering. He had ticked off the world's strongest hitman in less than a minute. He then felt a gun pointed at him. He reached for his own gun silently to fire it on the bullet that the hitman would fire at him.

Reborn then fired it at the brunet and he was surprised that the bullet did not even reached the bed.

"Can you go out of my room now?" Tsuna said a tiredly.

"No. I'm your home tutor."

"I don't need a home tutor."

"Said the one who always failed every of his test." Reborn said mockingly.

"Very well asked me ten questions and if I don't give you a correct answer I'll accept you as my tutor but if I answered them all correct You won't be my tutor and you'll let me ruin you plan freely. Is it a deal or no deal?

"Deal"

"Then you can start now."

"Give me a detailed information about Physics." Reborn smirked. He gave him a hard question right from the start.

"Physics is from Ancient Greek: φύσις physis "nature." It is a part of natural philosophy and a natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves. Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy. Over the last two millennia, physics was a part of natural philosophy along with chemistry, certain branches of mathematics, and biology, but during the Scientific Revolution in the 17th century, the natural sciences emerged as unique research programs in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms of other sciences, while opening new avenues of research in areas such as mathematics and philosophy. Physics also makes significant contributions through advances in new technologies that arise from theoretical breakthroughs. For example, advances in the understanding of electromagnetism or nuclear physics led directly to the development of new products which have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus. Do you want more 'detailed' explanation?" Tsuna asked sarcartically.

Reborn was shocked for the fourth time in that day by the same man. "No, that enough. What is Italy?"

"Italy, Italia, officially the Italian Republic, Repubblica italiana, is a unitary parliamentary republic in Southern Europe. To the north, it borders France, Switzerland, Austria, and Slovenia along the Alps. To the south, it consists of the entirety of the Italian Peninsula, Sicily, Sardinia–the two largest islands in the Mediterranean Sea–and many other smaller islands. The independent states of San Marino and the Vatican City are enclaves within Italy, while Campione d'Italia is an Italian exclave in Switzerland. The territory of Italy covers some 301,338 km2 and is influenced by a temperate seasonal climate. With 60.8 million inhabitants, it is the fifth most populous country in Europe, and the 23rd most populous in the world." Tsuna then stopped for air. "It is also a place where the mafia started to appear."

Reborn was starting to think of a new question but stopped when he heard the the brunet to say the word 'mafia.'

"What is the world's most powerful and influential mafia familia?" Reborn raised a brow.

Knowing that he can't lie to the baby in his tired state he told him the truth.

"Vongola."

"What is Vongola?"

"Italian word for clam" Tsuna answered while doing his best not to laugh.

"What is the 'VONGOLA FAMILIA'?" Reborn said with a vein popped on his head.

"The Vongola Famiglia has long since been the most powerful Mafia Famiglia in all of Italy. Several other Famiglias serve under the Vongola umbrella, including several members of the infamous Arcobaleno. Even when there is internal strife, members of the Vongola stand united to repel attack from opposing Famiglia, living up to their title as the best and the Vongola came into being after Cozarto Simon suggested to Giotto, the Vongola Primo, to create a vigilante group in order to protect the people. From then on, each generation of the Vongola Famiglia has donned formal attire when risking their lives to fulfill this duty. The Vongola originally started as a vigilante organization, but their ways gradually changed during Vongola Secondo's reign, starting to turn towards violence and influence of the Vongola is worldwide, and it was said that no Famiglia can match them in terms of size, tradition, rules, or power, and due to this, the boss of the Vongola is considered by many to be the capo di tutti capi, or the "Boss of all Bosses". At the moment, the Vongola Famiglia is led by the Vongola Nono, Timoteo, but will soon be succeeded by the Vongola Decimo."

'This boy is no ordinary boy.' Reborn thought.

"Of course I'm not ordinary."

Reborn raised a brow again. The boy can read his mind. Someone can read the world's strongest hitman's mind.

"Do you have any connection to the mafia?"

"You already know it. My dad. CEDEF."

Reborn was stunned yet again. The boy already knew his father being in the mafia.

"Other than him. Are connected to the mafia?"

"Yeah."

"To whom?"

"Two hundred mafia bosses."

Reborn was speechless. That was more than the mafia familia that he had interacted with.

"Who are you?"

"Sawada Tsunayoshi."

"Who are you IN THE MAFIA?" Reborn was irritated. He can see the boy smirking at him.

"Cielo, the world's greatest hacker and one of the world's strongest hitman. Now I'm finished answering your questions, so that means you're not my tutor and I'm allowed to ruin your plans."

Reborn didn't even move from his place. He was to shocked of the information. The boy in front of him is the world's greatest hacker and one of the world's strongest hitman and he was just thirteen years old, so that means he stepped into the darkness when he was eight years old. Cielo had appeared in the underground world five years ago.

"Ta-kun, Tsu-kun, Reborn-kun dinner's ready." Nana's voice echoed in the whole house.

"Hai, Kaa-san… Coming." Tsuna said happily.

He quickly move to the door and look at the tiny creature at the floor and smiled.

"Well then Reborn. Nice to meet you." He hurried down the stairs and went to the kitchen.

Jā, mata ne.

See you later.